Polypropylene is a general-purpose resin closely related to our daily life. It is the most important downstream product of propylene. It is 50% of the world's propylene, and 65% of China's propylene is used to make polypropylene. Polypropylene is the world's fastest growing general-purpose thermoplastic resin, second only to polyethylene and polyvinyl chloride. In 1998, the world's polypropylene production capacity was 29.25 million tons. In 1997, the world's total polypropylene production was about 23.9 million tons, with an output value of about 21 billion US dollars. Since 1991, world production has grown at an average annual rate of 9%, which is second only to LLDPE in general-purpose resins.
Like other general-purpose resins, the Asian financial crisis has had a major impact on demand for polypropylene, and polypropylene has maintained a relatively strong growth rate compared to other resins, even at lower forecast levels. The new forecast shows that the world's polypropylene demand grew at an average annual rate of 7.1% from 1997 to 2002, compared with 5.2% for polyethylene, 5.0% for PVC and 4.1% for polystyrene. The reasons for the rapid growth of polypropylene demand can be summarized as follows: cheap, light, good processability and versatility, and the development of catalysts and new processes further promotes the expansion of applications such as automotive and food packaging. The development has further boosted demand. In the past, there was not much polypropylene used in the automotive industry. In the past, polypropylene was rarely used in blow molding and thermoforming. Some people say: "As long as the material of one product is replaced by plastic, then this product has the potential to use polypropylene."
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